6606406840 has 128 divisors (see below), whose sum is σ = 17081694720. Its totient is φ = 2276032000.

The previous prime is 6606406813. The next prime is 6606406843. The reversal of 6606406840 is 486046066.

It is a super-2 number, since 2×6606406840² = 87289222671197571200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6606406793 and 6606406802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6606406843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1079790 + ... + 1085890.

It is an arithmetic number, because the mean of its divisors is an integer number (133450740).

Almost surely, 2^6606406840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6606406840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8540847360).

6606406840 is an abundant number, since it is smaller than the sum of its proper divisors (10475287880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6606406840 is a wasteful number, since it uses less digits than its factorization.

6606406840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253 (or 6249 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 6606406840 is about 81279.8058560673. The cubic root of 6606406840 is about 1876.3842189746.

The spelling of 6606406840 in words is "six billion, six hundred six million, four hundred six thousand, eight hundred forty".